CN104878592B - Arranging method of single-faced super-hydrophobic cotton fabrics - Google Patents

Abstract

The invention discloses a method for finishing single-sided superhydrophobic cotton fabrics, which uses foam finishing technology to prepare a silica sol foam finishing agent and a water-based fluorine-containing polyacrylic acid water-repellent foam finishing agent, and uniformly scrape and coat them on the surface of cotton fabrics in sequence, Keep the liquid carrying rate low, control the finishing agent only on one side of the cotton fabric without penetration, then steam-baking-washing, and form a coating on one side of the cotton fabric, so that the fabric is roughened on one side, and greatly Reduce the surface free energy of cotton fabrics and endow cotton fabrics with superhydrophobicity on one side. After repeated washing, it still has a good hydrophobic effect, and it is a practical, environmentally friendly, and efficient method for superhydrophobic finishing of cotton fabrics on one side; the invention is easy to operate, uses less water, has simple processes, and low energy consumption; the cotton fabric of the invention The liquid carrying capacity of the fabric is very low, and it is suitable for one-sided water-repellent finishing of uneven thick cotton fabrics, and the preparation of one-sided superhydrophobic cotton fabrics can meet people's special requirements for functionality and comfort, and has a good application prospect.

Description

A kind of finishing method of superhydrophobic cotton fabric on one side

technical field

The invention belongs to the field of functional finishing of textiles, in particular to a method for preparing a single-sided superhydrophobic cotton fabric.

Background technique

Cotton fabric has good hygroscopicity and air permeability, comfortable to wear, soft to the touch, soft luster, rustic, full of natural beauty; its warmth retention and dyeability are also good. Therefore, it is favored by consumers. However, cotton fabric has good hygroscopicity and hydrophilic properties, and is easily wetted by water and stained by oil, which brings inconvenience to its wearing and use. Therefore, it is necessary to carry out hydrophobic finishing on cotton fabrics. Recently, inorganic nanoparticles such as silica, titanium dioxide, and zinc oxide have been used to construct rough microstructures, and then chemical surface modification has successfully endowed various substrates with hydrophobic functions. The main principle is to use the "lotus leaf effect" to prepare nanoparticles on the surface of the fabric through sol-gel method, chemical vapor deposition method, phase separation method and other methods to obtain hydrophobic textiles. However, most hydrophobic textiles produced commercially or in laboratories are typical double-sided hydrophobic, which seriously affects the hand, comfort and safety of cotton fabrics, and some methods are cumbersome, harsh conditions, and low durability. Therefore, fabrics with positive and negative surface hydrophilicity (one side is hydrophobic and the other side retains inherent hydrophilicity) have attracted extensive attention from researchers. The hydrophobic surface can repel water, oil and self-cleaning; while the hydrophilic surface retains its excellent inherent properties, such as softness, breathability, comfort and low irritation.

At present, textiles with asymmetric hydrophilicity on both surfaces can be obtained through physical treatment and chemical finishing. The physical method can realize multi-layer structure by controlling different types of yarns and rules in the weaving process. Each layer contains different yarns or fibers with different structures (different hygroscopicity and hydrophilicity), and two-surface hydrophilicity is obtained. heterosexual material. However, this method requires special structured yarns and the weaving process is complicated. The other is to spray a hydrophobic finishing agent on the surface of the fabric on one side through digital printing, but the efficiency is low and it is difficult to industrialize. The method of chemical finishing is generally to carry out the finishing agent through the rolling-baking-baking process, the equipment is simple and the operation is convenient. However, due to the porous, uneven structure and high hygroscopicity of cotton fabrics, it is difficult to ensure single-sided superhydrophobic finishing. Therefore, it is imminent to develop hydrophobic and hydrophilic double-sided heterosexual cotton fabrics. The foam finishing technology uses part of the air to replace the liquid phase water. Because of its very low liquid-carrying rate, it is more suitable for single-sided finishing of porous textiles, and it uses less water and consumes less energy.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for preparing a single-sided superhydrophobic cotton fabric. The finishing method is easy to operate, simple in process, and good in operability; and the method is low in liquid supply and high in energy saving, and is suitable for single-sided water-repellent finishing of uneven thick cotton fabrics, and the preparation of single-sided superhydrophobic cotton fabrics meets people's needs. Special requirements for functionality and comfort. The hydrophobic surface can repel water, oil and self-cleaning; while the hydrophilic surface retains its excellent inherent properties, such as softness, moisture absorption, comfort and low irritation.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A method for finishing a single-sided superhydrophobic cotton fabric, the steps are as follows:

(1) Pre-condition the cotton fabric to control the moisture regain at 8±0.5%;

(2) Mix 3wt% silica sol with a pH of 3.5~4.5, Gemini surfactant and stabilizer evenly, and stir at high speed to prepare a foamed silica sol finishing agent;

(3) Divide 5-10 wt% water-based fluorocarbon-modified polyacrylic acid, Gemini surfactant and stabilizer were mixed evenly, and stirred at high speed to prepare foamy water-based fluorocarbon-modified polyacrylic acid finishing agent;

(4) Apply the foamed silica sol finishing agent prepared in step (2) evenly on one side of the cotton fabric after the pre-humidification treatment in step (1), then steam at 100°C for 5 minutes, rinse until neutral, and dry , Humidity control, control moisture regain at 8±0.5%;

(5) In the step (4), one side of the same cotton fabric is uniformly scraped and coated with foamed water-based fluorocarbon modified polyacrylic acid finishing agent, steamed at 100°C for 5 minutes, baked, and washed to obtain a single-sided superhydrophobic cotton fabric.

The Gemini surfactant is sodium alkyl diphenyl ether disulfonate or an ester group-containing double root quaternary ammonium salt surfactant.

The stabilizer is polyacrylamide or Tween 80.

The amount of silica sol in the step (2) is 5g/L, the amount of Gemini surfactant is 2-4g/L, and the amount of stabilizer is 1 g/L, wherein the preparation method of silica sol is as follows: Ethyl acetate, deionized water and ethanol are mechanically stirred and mixed at a volume ratio of 1:2:2 until the solution is clear, adjusted to pH 3.5~4.5 with glacial acetic acid, and diluted with water to obtain a stable and dispersed silica sol finishing agent.

In the step (3), the amount of water-based fluorocarbon-modified polyacrylic acid is 5-8g/L, the amount of Gemini surfactant is 2-4g/L, and the amount of stabilizer is 1 g/L, wherein the water-based fluorocarbon The preparation method of modified polyacrylic acid is as follows: add fluorine-containing polyacrylate to dilute ammonia solution (volume ratio of fluorine-containing polyacrylate and dilute ammonia solution is 1:30~70) to obtain a mixed solution, add oxidizing agent (potassium sulfate, hydrogen peroxide or potassium permanganate) to stir until the solution is clear, then drop penetrant (alkali-resistant penetrant AEP or alkali-resistant penetrant OEP-70) to obtain fluorine-containing polyacrylic acid finishing agent, the concentration of the oxidant is 8 ~12g/L, the concentration of penetrant is 0.8~1g/L.

The speed of high-speed stirring in the step (2) and step (3) is 3000-5000 rpm.

In the step (4), the drying temperature is 145-155°C, and the drying time is 3-5 minutes.

The baking temperature in the step (5) is 160-170° C., and the baking time is 3-5 minutes.

The schematic diagram of single-sided superhydrophobic finishing of cotton fabric is shown in Figure 2. The basic constituent material of cotton is cellulose, and its molecule is a linear macromolecule formed by the dehydration condensation of many glucose molecules. Hydroxyl groups in cellulose molecules are the basis for hydrophobic finishing. Silica hydrosol is easy to prepare and has good water solubility. It can prepare foam finishing agent through Gemini surfactant, and apply foam technology to the surface of fabric to give the fabric a rough surface. The water-based fluorocarbon-modified polyacrylic acid water-repellent foam finishing agent can be scraped on the surface of the fabric by the same method to form a hydrophobic layer composed of fluorine-containing groups, giving the fabric good hydrophobicity.

Beneficial effects of the present invention: (1) The present invention utilizes foam finishing technology to prepare silica sol foam finishing agent and water-based fluorine-containing polyacrylic acid water-repellent foam finishing agent, and uniformly scrape and coat them on the surface of cotton fabric in turn to keep low liquid entrainment rate, the finishing agent is only on one side of the cotton fabric, and does not penetrate, and then steaming-baking-washing forms a coating on one side of the cotton fabric, making the fabric rough on one side, and greatly reducing the surface freedom of the cotton fabric. Capable of imparting superhydrophobicity to one side of cotton fabrics. After repeated washing, it still has a good hydrophobic effect, which is a practical, environmentally friendly and efficient method for superhydrophobic finishing of cotton fabrics on one side; (2) the invention is easy to operate, requires less water, simple process and low energy consumption; (3) The cotton fabric of the present invention has a very low amount of liquid, and is suitable for single-sided water-repellent finishing of uneven heavy cotton fabrics, and the preparation of single-sided superhydrophobic cotton fabrics, which meets people's special requirements for functionality and comfort. It has a good application prospect.

Description of drawings

Fig. 1 is a structural schematic diagram of the foam scraping device of the present invention.

Fig. 2 is a schematic diagram of superhydrophobic finishing of cotton fabric on one side of the present invention.

detailed description

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Example 1

The finishing method of the single-sided superhydrophobic cotton fabric of the present embodiment, the steps are as follows:

(1) Pre-condition the cotton fabric to control the moisture regain at 8±0.5%;

(2) Add 3wt Silica sol with %pH=4.5, 2g/L sodium alkyl diphenyl ether disulfonate, 1g/L polyacrylamide stabilizer, and tap water were uniformly mixed, and stirred at a high speed of 3000 rpm to prepare foamed silica sol finishing agent;

(3) Mix 5wt% water-based fluorocarbon-modified polyacrylic acid, 2g/L ester-containing double root quaternary ammonium salt surfactant, 1g/L polyacrylamide stabilizer, and tap water, and stir at 3000 rpm Preparation of water-based fluorocarbon modified polyacrylic acid finishing agent;

(4) Fix the cotton fabric 6 on the metal roller collection device 5, inject the prepared silica sol foam finishing agent into the holding container 1, and control the extrusion amount of the foam 3 through the piston rod at the upper end of the container to pump the piston 2 (such as As shown in Figure 1); scraper 4 controls the amount of surface foam finishing agent, and by adjusting the pressure, ensure that the surface foam is evenly dispersed, first coat continuous silica sol finishing agent, steam at 100°C for 5 minutes, and then rinse 3 times until neutral , bake at 150°C for 3 minutes, adjust the humidity, and control the moisture regain at 8±0.5%;

(5) According to the method of step (4), apply water-based fluorocarbon modified polyacrylic acid finishing agent evenly on the same surface, steam at 100°C for 5 minutes, bake at 160°C for 3 minutes, and wash with water to obtain a single-sided superhydrophobic cotton fabric.

Example 2

The finishing method of the single-sided superhydrophobic cotton fabric of the present embodiment, the steps are as follows:

(1) Pre-condition the cotton fabric to control the moisture regain at 8±0.5%;

(2) Add 3wt Silica sol with %pH=3.5, 3g/L Gemini surfactant, 1g/L polyacrylamide stabilizer, and tap water were uniformly mixed, and stirred at a high speed of 4000 rpm to prepare foamed silica sol finishing agent;

(3) Add 8 wt %Water-based fluorocarbon-modified polyacrylic acid, 3g/L Gemini surfactant, 1g/L polytween 80 stabilizer, and tap water were uniformly mixed, and stirred at a high speed of 4000 rpm to prepare a water-based fluorocarbon-modified polyacrylic acid finishing agent;

(4) Evenly scrape the prepared foam finishing agent on one side of the pre-conditioned cotton fabric, then steam it at 100°C for 5 minutes, then rinse it for 3 times to neutral, dry and adjust the humidity, and control the moisture regain at 8±0.5 %;

(5) Apply water-based fluorocarbon-modified polyacrylic acid finishing agent evenly on the same surface, steam at 100°C for 5 minutes, bake at 170°C for 3 minutes, and wash with water to obtain a single-sided superhydrophobic cotton fabric.

Example 3

The finishing method of the single-sided superhydrophobic cotton fabric of the present embodiment, the steps are as follows:

(1) Pre-condition the cotton fabric to control the moisture regain at 8±0.5%;

(2) Add 3wt Silica sol with %pH=4, 4g/L Gemini surfactant, 1g/L stabilizer, and tap water were uniformly mixed, and stirred at a high speed of 5000 rpm to prepare foamed silica sol finishing agent;

(3) Add 10 wt %Water-based fluorocarbon-modified polyacrylic acid, 4g/L Gemini surfactant, 1g/L stabilizer, and tap water were uniformly mixed, and stirred at a high speed of 5000 rpm to prepare a water-based fluorocarbon-modified polyacrylic acid finishing agent;

(4) Evenly scrape the prepared foam finishing agent on one side of the pre-conditioned cotton fabric, then steam it at 100°C for 5 minutes, then rinse it for 3 times to neutral, dry and adjust the humidity, and control the moisture regain at 8±0.5 %;

(5) Apply a water-based fluorocarbon-modified polyacrylic acid finish evenly on the same surface, steam at 100°C for 5 minutes, bake at 180°C for 3 minutes, and wash with water to obtain a single-sided superhydrophobic cotton fabric.

The test result of the contact angle of the single-sided super-hydrophobic cotton fabric that embodiment 1～3 arranges is as follows:

As can be seen from the table, in the contact angle test of the unfinished cotton fabric surface in Examples 1 to 3, the droplet disappeared quickly after dripping, and the contact angle was close to 0°. The surface contact angle of the double-finishing side of the single-sided foam can reach more than 144°, or even exceed 150°, and it still has a surface contact angle close to 135° after washing, which has good hydrophobicity and fastness. It can meet people's requirements for fabric comfort and water repellency.

Claims (5)

1. the method for sorting of an one side super-hydrophobic cotton fabric, it is characterised in that step is as follows:

(1) bafta is carried out pre-conditioned process, control regain 8 ± 0.5%；

(2) by Ludox, Gemini surface active and stabilizer mix homogeneously that 3wt %, pH are 3.5 ~ 4.5, and high-speed stirred prepares foam Ludox finishing agent；

(3) by the 5-10 watersoluble fluorine-carbon modified polyacrylic acid of wt %, Gemini surface active and stabilizer mix homogeneously, and high-speed stirred prepares foam watersoluble fluorine-carbon modified polyacrylic acid finishing agent；

(4) the foam Ludox finishing agent that step (2) prepares uniformly scratching the bafta one side after step (1) pre-conditioned processes, then 100 DEG C of gas steam 5min, rinse to neutrality, and drying, damping control regain 8 ± 0.5%；

(5) in step (4), same bafta one side uniformly scratches foam watersoluble fluorine-carbon modified polyacrylic acid finishing agent, and 100 DEG C of gas steam 5min, bake, wash, obtain one side super-hydrophobic cotton fabric；

Described Gemini surface active is alkyl diphenyl ether disulphonic acid sodium or the double joint quaternary surfactant Han ester group；

Described stabilizer is polyacrylamide or Tween 80；

In described step (2), the consumption of Ludox is 5g/L, and the consumption of Gemini surface active is 2-4g/L, and the consumption of stabilizer is 1 g/L.

The method for sorting of one side super-hydrophobic cotton fabric the most according to claim 1, it is characterized in that: in described step (3), watersoluble fluorine-carbon modified polyacrylic consumption is 5-8g/L, the consumption of Gemini surface active is 2-4g/L, and the consumption of stabilizer is 1 g/L.

The method for sorting of one side super-hydrophobic cotton fabric the most according to claim 1, it is characterised in that: the rotating speed of described step (2) and the stirring of step (3) high speed is 3000-5000 rev/min.

The method for sorting of one side super-hydrophobic cotton fabric the most according to claim 1, it is characterised in that: drying temperature in described step (4) and be 145-155 DEG C, drying time is 3 ~ 5min.

The method for sorting of one side super-hydrophobic cotton fabric the most according to claim 1, it is characterised in that: in described step (5), baking temperature is 160-170 DEG C, and the time of baking is 3 ~ 5min.